Categories
CVE-2026-40299

next-intl has an open redirect vulnerability

Summary

next-intl has an open redirect vulnerability

Original description

The description as published by the source.

next-intl provides internationalization for Next.js. Applications using the next-intl middleware prior to version 4.9.1with localePrefix: 'as-needed' could construct URLs where path handling and the WHATWG URL parser resolved a relative redirect target to another host (e.g. scheme-relative // or control characters stripped by the URL parser), so the middleware could redirect the browser off-site while the user still started from a trusted app URL. The problem has been patchedin next-intl@4.9.1.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

References

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